Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202111615
Keywords
Bronsted acid; Lewis acid; lignin; spinel oxides; cleavage; heterogeneous catalysis
Categories
Funding
- National Natural Science Foundation of China [22078069, 22178069]
- Guangdong Basic and Applied Basic Research Foundation [2019B151502038]
- National Key Research and Development Plan [2018YFB1501503]
- Guangdong Province Key Research and Development Plan [2020B1111380002]
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This paper presents a new strategy to tune the active sites of catalysts for the selective cleavage of lignin to produce aromatic monomers. The authors achieved this by adjusting the non-stoichiometric ratio of nickel and cobalt. The optimized Ni0.2Co2.8O4 catalysts showed outstanding catalytic conversion and selectivity for lignin cleavage.
Rational design and construction of catalysts with regulable active sites for selective cleavage of lignin to produce aromatic monomers remain challenging. Herein, the authors report a new strategy for tuning the active sites of tetrahedral centers (Lewis acid sites) and octahedral centers (Bronsted acid sites) in NixCo3-xO4 through tailoring the non-stoichiometric ratio of Ni and Co. The ratio of Ni and Co is experimentally optimized for the optimal acidic activity of catalytic cracking of lignin when x = 0.2. The Ni0.2Co2.8O4 catalysts achieve an outstanding catalytic conversion (up to 81 wt%) for the lignin cleavage and excellent selective cleavage into aromatic monomers (up to 90.30 wt%), which is mainly attributed to the optimized electron rearrangement, adjustable active sites, and synergistic effect between these two active sites. This work provides a new concept to rationally design solid acid catalysts for the efficient conversion of lignin.
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